Simple Interest Calculator
Simple interest and total amount for any principal, rate and period in years, months or days.
Simple interest
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Total amount—
How to use the Simple Interest calculator
- Enter principal, rate, time and unit.
- Read the simple interest at the top of the result, with total amount underneath. It updates as you type.
- Change one input at a time to see what moves the answer most, then save the result with Copy link or Download PDF.
About this tool
Simple interest is charged on the principal only. It is used for many gold loans, private loans and education-loan moratoriums.
Formula: SI = P × R × T ÷ 100
Worked example
With principal of ₹1,00,000, rate of 8%, time of 2 and unit of Years:
| Simple interest | ₹16,000 |
| Total amount | ₹1,16,000 |
Built and reviewed by Savitar Finance (savitarfinance@gmail.com). Rules and rates last checked October 2026. How we calculate · Report a problem
Questions people ask
What is the formula for simple interest?
SI = P × R × T ÷ 100, where T is in years. For days, T = days ÷ 365.
How is simple interest different from compound interest?
Compound interest also charges interest on past interest, so it grows faster over time.